<?php

namespace app\utility;
use think\facade\Cache;
class Jwt
{

    /**
     * @desc 生成token
     * @param $userId // 用户id
     * @param $key  // 前后台不一致的key
     * @return string
     */
    public function getToken($userId, $key): string
    {
        $payload = [
            'data' => [
                'userId' =>$userId
            ],
            'iss' => 'qwueiqnyuqjezchiw', // 随机
            'aud' => '',
            'iat' =>time()
        ];

        return 'Bear' . \Firebase\JWT\JWT::encode($payload, $key, 'HS256');
    }

    /**
     * 后端生成token
     * @param $userId // 用户id
     * @return string
     */
    function generateToken($userId)
    {
        //获取当前时间戳
        $currentTime = time();
        $data = array(
            "iss" => 'coinwerqwerasdf',        //签发者 可以为空
            "aud" => '',             //面象的用户，可以为空
            "iat" => $currentTime,   //签发时间
            "nbf" => $currentTime,   //立马生效
            "exp" => $currentTime + 3600*24, //token 过期时间 1天
            "data" => [              //记录的userid的信息
                'user_id' => $userId,
            ]
        );
        //生成token
        $token = \Firebase\JWT\JWT::encode($data, env('ENCRYPT.ADMINSALT'), "HS256");

        return 'Bear'.$token;
    }

    /**
     * 检查token有效性
     * @param $token
     * @return array|int[]
     */
    public function chekToken($token)
    {
        $status=array("code"=>2);
        if(!$token){
            $status['msg']="token缺失";
            return $status;
        }

        $len=4;
        $bear=substr($token,0,6);
        if($bear=='Bearer'){
            $len=6;
        }
        $token = trim(substr_replace($token,'',0,$len)," ");
        try {
            \Firebase\JWT\JWT::$leeway = 60;//当前时间减去60
            $decoded = \Firebase\JWT\JWT::decode($token, new \Firebase\JWT\Key(env('ENCRYPT.ADMINSALT'), 'HS256'));
            $arr = (array)$decoded;
            $res['code']=1;
            $res['data']=$arr['data'];
            return $res;

        } catch(\Firebase\JWT\SignatureInvalidException $e) { //签名不正确
            $status['msg']="token签名不正确";
            return $status;
        }catch(\Firebase\JWT\BeforeValidException $e) { // 签名在某个时间点之后才能用
            $status['msg']="token失效";
            return $status;
        }catch(\Firebase\JWT\ExpiredException $e) { // token过期
            $status['msg']="token失效";

            return $status;
        }catch(\Exception $e) { //其他错误
            $status['msg']="未知错误";
            return $status;
        }
    }




}